feat: add default height for Repl component (vuejs#109)

Author: zqran

src/Repl.vue

@@ -101,11 +101,12 @@ provide('preview-options', props.previewOptions)
   --color-branding-dark: #416f9c;
   --header-height: 38px;
 
+  height: 100%;
+  margin: 0;
+  overflow: hidden;
   font-size: 13px;
   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
     Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
-  margin: 0;
-  overflow: hidden;
   background-color: var(--bg-soft);
 }